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Figure 3 shows the main features of a cathode ray tube (CRT) of a cathode ray oscilloscope (CRO).
(i) Describe how the electrons are produced in the tube.
(ii) State and explain the function of the grid.
(iii) State what would be observed on the screen if an a.c voltage is connected across the y-plates.
(iv) State how the deflection system of a television differs from that of a CRO.
(v) Give the reason why it is possible to have a wider screen in the television in the television set than onthe CRO.